Improvement in grinding-machines



A. WARTH.

Grinding-Machine.

No. 202,899. Patented April 23,1878.

xl 'xfk o,l G, .wq B a BJ L ff UNITED STATES PATENT OFFICE.

ALBIN WARTH, OF STAPLETON, NEW YORK.

IMPROVEMENT IN GRINDING-MACHl-NES.

Specification forming part of Letters Patent No. 202,899, dated April23, 187B application filed March 13, 1878.

To all whom it may concern.-

Be it known that I, ALBIN WARTH, of Stapleton, in the county of Richmondand State of New York, have invented a new and useful Improvement inGrinding-Stones, which iinprovement is fully set forth in the followingspecification, reference being had to the accompanying drawings, inwhich- Figure 1 represents a side view. Fig. 2 is a front view. Figs. 3and 4 are horizontal sections in the plane x x, Fig. l, showing the thegrinding-disk in different positions. Fig. 5 is a plan of theswivel-pedal, which serves to adjust the grinding-disk in the requiredposition. Fig. 6 is a sectional plan or top view of a modification. Fig.7 is a side view of the same, partly in section.

Similar letters indicate corresponding parts.

This invention consists in a novel construction of swivel-mountings andadjusting dcvices for grinding and polishing stones.

In the drawings, the letter A designates a table or frame, whichsupports a standard, B. This standard is provided with a socket, a,which forms the bearing for the shank b of a swivel-head, C.

In the example shown in Figs. l to 4, inclusive, the shank b is hollowor tubular, its bore being suftlciently large to allow the driving-beltD to pass freely through it, and the head is provided with two arms, cc, which form the bearings for a spindle, E, on which are mounted thegrinding-disk F and the pulley G. The belt D extends from the pulley Gover guide-pulleys H to a pulley, I, which is mounted on thedriving-shaft J. Round the head C is placed a belt, K, which is fastenedby screws d, and the ends of which extend down under guide pulleys L,and are carried round a pulley, M, to which they are fastened by screwsc, Fig. l, and ou which is secured a pedal, N.

The guide-pulleys L are mounted on a horizontal shaft, O, which has itsbearings in a bracket, P, which is secured to the bed-plate of the frameA, and from which rises a stud, on which revolves the pulley M. Byturning the pulley M the swivel-head C is caused to turn in the standardB, and the grinding-disk can be adjusted so that either of its sides orits face is in working position.

The operation of turning the pulley M is effected by means of the foot,which is placed on the pedal N, and which also serves to retain thegrinding-disk in the required position, leaving both hands free for themanipulation of the article to be ground.

The object of this arrangement is to facilitate the operation ofgrinding tools or cuttinginstruments which have to be ground on bothfaces, cach face being placed against one of the sides of thegrinding-disk. In grinding' one face of a tool of this kind, thegrinding disk is turned to the position shown in Fig. 3, so that thesame revolves in the direction ofthe arrowmarked thereon, and the faceto be ground is held upon the right-hand side of the disk. In grindingthe opposite face of the tool, the grinding-disk is turned to theposition shown in Fig. 4, causing in to revolve in the direction of thearrow marked on it in that figure, and the face to be ground is heldupon the left-hand side of the disk. By these means the grinding-diskrevolves from the operator in grinding either face of the tool, and theoperation of grinding can be accomplished with facility and with theleast possible waste.

On each side of the grinding-disk F is secured a honing-disk, Q, ofleather, wood, castiron, or other suitable material, so that theoperation of honing the faces of the cuttingtool can be effectedimmediately after they have been ground.

In the example shown in Figs. 6 and 7, the shank b of the swivel-head Cis solid, and secured in the socket a of the standard B by a set-screw.In this case the swivelhead is provided with two large holes for thepassage of the driving-belt, and has only one arm, c, which forms thebearing for the spindle E of the grinding-disk F and pulley Gr.

If the grinding-disk is turned to the position shown in Figs. 6 and 7,its upper face is entirely free and unobstructed, which is of advantagefor certain kinds of articles to bc ground.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination of the stationary standard B, carrying the annularsocket or band a., the swiveling head C, having through it abeltpassage, and embraced by said socket or band,

the arms 0, and the grindstone-pulley hnv- In testimony that I elaim theforegoing I ing its shaft-bearings in the ends oi said arms, havehereunto set my hand this 12th day of the belt D, stationaryguide-pulleys h h, and Mnrvh, 1878.

large pulley I, all constructed and mounted upon a. stand, A,suhstaln[iall)Y as described. ALBIN VVARTII.

2. The combination, with the swivel-head C,

Ps1-Frying the spindle of a grinding stone or Witnesses:

disk, 0f a swivel-pedal,whichconnects with the W. IIAIFF,

swivel-head by means of :L belt, substantially ll. I". KAsTI-:NHIBI-:IL

as and for the purpose set forth.

